Stubborn aphids! HELP!
Don't know if you recall me and my old Hoya plant, Jose. The last 6 months or so he has been attacked by these nasty little brownish tannish yellowish aphids! They attack his new growth and his flowers. Seems they cannot do any damage to the tougher mature leaves thank goodness. We have tried Houseplant insecticide with pyrethrins. We did it twice and the little nasty things keep coming. Is there any systemic insecticide we can add to his water to kill these things?? In all the 40 plus years we've had Jose I have never seen these pests before!!